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Quantum Information Processing

Partition-based discrete-time quantum walks

  • 01-04-2018
Published in:
Authors
Norio Konno
Renato Portugal
Iwao Sato
Etsuo Segawa
Published in
Quantum Information Processing | Issue 4/2018

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Abstract

We introduce a family of discrete-time quantum walks, called two-partition model, based on two equivalence-class partitions of the computational basis, which establish the notion of local dynamics. This family encompasses most versions of unitary discrete-time quantum walks driven by two local operators studied in literature, such as the coined model, Szegedy’s model, and the 2-tessellable staggered model. We also analyze the connection of those models with the two-step coined model, which is driven by the square of the evolution operator of the standard discrete-time coined walk. We prove formally that the two-step coined model, an extension of Szegedy model for multigraphs, and the two-tessellable staggered model are unitarily equivalent. Then, selecting one specific model among those families is a matter of taste not generality.

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previous article Vertices cannot be hidden from quantum spatial search for almost all random graphs
next article Time-optimal control with finite bandwidth
Title
Partition-based discrete-time quantum walks
Authors
Norio Konno
Renato Portugal
Iwao Sato
Etsuo Segawa
Publication date
01-04-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 4/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-017-1807-4
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